Data Series 345
U.S. GEOLOGICAL SURVEY
Data Series 345
Table 3. Quality control results from nutrient and carbon analyses, along with benthic and seston chlorophyll a and ash-free dry weight as part of the National Water Quality Assessment Nutrient Enrichment Effects Team Study.
[RTH chlorophyll a, chlorophyll a occurring on rock or wood; RTH-AFDW, organic matter ash-free dry weight on rock or wood; DTH chlorophyll a, chlorophyll a on fine-grained substrate from depositional habitats; DTH-AFDW, organic matter ash-free dry weight on fine-grained material collected from depositional habitat; SES chlorophyll a, chlorophyll a from seston (water column) sample]
| Constituent | Number of samples | Percentage of difference between replicate samples | ||
|---|---|---|---|---|
| Minimum | Maximum | Mean | ||
| Nutrients | ||||
| Nitrogen, ammonia, filtered | 16 | 0 | 11 | 1.8 |
| Nitrogen, nitrite, filtered | 16 | 0 | 14 | 3 |
| Nitrogen, ammonia plus organic (Kjeldahl), unfiltered | 9 | 0 | 3 | 1.6 |
| Nitrogen, nitrite plus nitrate, filtered | 16 | 0 | 17 | 1.6 |
| Total nitrogen, nitrate plus nitrite plus ammonia plus organic-N, unfiltered | 7 | 0 | 9 | 2 |
| Phosphorus, orthophosphate, filtered | 16 | 0 | 5 | 1.2 |
| Total phosphorus, unfiltered | 16 | 0 | 42 | 5.6 |
| Carbon | ||||
| Organic carbon in filtered water | 15 | 0 | 14 | 1.9 |
| Inorganic carbon in suspended sediment | 15 | 0 | 6 | 0.4 |
| Organic carbon in suspended sediment | 15 | 1 | 20 | 6.8 |
| Inorganic plus organic carbon in suspended sediment | 15 | 1 | 19 | 6.7 |
| Particulate nitrogen in suspended sediment | 15 | 0 | 13 | 5.1 |
| Benthic and seston | ||||
| Richest targeted habitat periphyton chlorophyll a | 8 | 2 | 24 | 7.9 |
| Richest targeted habitat periphyton biomass as ash-free dry weight | 6 | 1 | 13 | 6.5 |
| Depositional targeted habitat periphyton chlorophyll a | 8 | 2 | 20 | 6.1 |
| Depositional targeted habitat periphyton biomass as ash-free dry weight | 6 | 0 | 35 | 11.4 |
| Seston chlorophyll a | 12 | 2 | 16 | 4.8 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/ds/345
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